Russia vs Muscovy

Russia and Muscovy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Russia	Yes	No	No	No
Muscovy	Yes	No	No	No

Russia (noun)	Muscovy (noun)
a former communist country in eastern Europe and northern Asia; established in 1922; included Russia and 14 other soviet socialist republics (Ukraine and Byelorussia and others); officially dissolved 31 December 1991	a Russian principality in the 13th to 16th centuries; Moscow was the capital
formerly the largest Soviet Socialist Republic in the USSR occupying eastern Europe and northern Asia
a former empire in eastern Europe and northern Asia created in the 14th century with Moscow as the capital; powerful in the 17th and 18th centuries under Peter the Great and Catherine the Great when Saint Petersburg was the capital; overthrown by revolution in 1917
a federation in northeastern Europe and northern Asia; formerly Soviet Russia; since 1991 an independent state